Add Gemfile, Rakefile for generating docs

.gitignore

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+.yardoc/
+public/

Gemfile

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+source 'https://rubygems.org'
+
+gem 'puppet', ENV['PUPPET_VERSION']
+gem 'rake'
+
+group :test do
+  gem 'facter', ENV['FACTER_VERSION']
+  gem 'hiera', ENV['HIERA_VERSION']
+  gem 'metadata-json-lint'
+  gem 'puppetlabs_spec_helper'
+  gem 'rspec-puppet-facts'
+  gem 'semantic_puppet'
+end
+
+group :docs do
+  gem 'puppet-strings'
+end

Rakefile

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+require 'puppetlabs_spec_helper/rake_tasks'
+
+defaults = [:validate, :spec]
+begin
+  if Gem::Specification::find_by_name('metadata-json-lint')
+    defaults = defaults.insert(0, :metadata_lint)
+  end
+  if Gem::Specification::find_by_name('puppet-lint')
+    require 'puppet-lint/tasks/puppet-lint'
+    exclude_paths = [
+      'bundle/**/*',
+      'pkg/**/*',
+      'vendor/**/*',
+      'spec/**/*'
+    ]
+    Rake::Task[:lint].clear
+    PuppetLint::RakeTask.new :lint do |config|
+      config.ignore_paths = exclude_paths
+    end
+    defaults = defaults.insert(-2, :lint)
+  end
+end
+task :test => defaults
+
+task :docs do
+  require 'puppet-strings'
+  # Remove TOC, as YARD generates its own
+  sh "sed -i 's/# alternc/## Description/' README.md"
+  PuppetStrings.generate(PuppetStrings::DEFAULT_SEARCH_PATTERNS, { :yard_args => ['--output-dir=public'] })
+end